DER-524 - 8 W TRIAC Dimmable, High Efficiency, Power Factor Corrected, Non-Isolated Buck-Boost LED DriverThis engineering report describesa TRIAC dimmable, non-isolated low side buck-boostLED driver designed to drive a nominal LED voltage string of 72 V at 115mA from an input voltage range of 195 VAC to 265VAC. The LED driver utilizes theLYT3325D from the LYTSwitch-3 family of devices.LYTSwitch-3 is a TRIAC dimmable LED driver IC with a single stage PFC functionand an accurateLED current control. It incorporates a smart bleeder drive for optimum dimming performance. DER-524providesa single 8W TRIAC dimmable constant current output.The key design goals were high efficiency, smallPCBfor compact size LED lamps and excellent dimmingcompatibility.The document contains the power supply specification, schematic, bill of materials,transformer documentation, printed circuit layout, design spreadsheet and performancedata.
